MIC2937A-12BU Equivalent & Substitute Parts

Part Overview

The MIC2937A-12BU is a linear voltage regulator IC from Microchip Technology designed for positive fixed 12V output at 750mA in a TO-263-3 surface mount package. This part is classified as obsolete, making identification of active equivalent and substitute parts essential for new designs and production continuity. The MIC2937A-12BU delivers regulated 12V output with integrated over-current and over-temperature protection across an operating temperature range of -40°C to 125°C. Due to its obsolete status and RoHS non-compliant classification, sourcing active alternatives is necessary for compliance with current manufacturing standards and long-term supply chain reliability.

Substiute Parts

MIC2937A-12BU

Microchip TechnologyIn Stock: 1960MIC2937A-12BU Datasheet

Current PartRFQ

MIC2937A-12WU

Microchip TechnologyIn Stock: 4139MIC2937A-12WU Datasheet

DirectRFQ

LM2937ES-12/NOPB

Texas InstrumentsIn Stock: 2687LM2937ES-12/NOPB Datasheet

MFR RecommendedRFQ

LM2937ESX-12/NOPB

Texas InstrumentsIn Stock: 2420LM2937ESX-12/NOPB Datasheet

MFR RecommendedRFQ

TL750M12QKTTRQ1

Texas InstrumentsIn Stock: 1503TL750M12QKTTRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MIC2937A-12BU is determined by the following critical parameters: fixed 12V output voltage, surface mount TO-263-3 package compatibility, positive output configuration, and operating temperature range of -40°C to 125°C. The substitute parts are grouped into two categories based on output current capability and product status:

Category 1: Direct Microchip Equivalent (Active Status) The MIC2937A-12WU maintains identical electrical specifications to the MIC2937A-12BU, including 750mA output current, 0.75V dropout voltage at 750mA, and TO-263-3 package. The primary distinction is active product status and RoHS3 compliance, making it the preferred direct replacement.

Category 2: Texas Instruments Alternatives (Active Status) The LM2937ES-12/NOPB and LM2937ESX-12/NOPB are Texas Instruments equivalents with identical 12V output and TO-263-3 package compatibility. These parts operate within the same temperature range and input voltage specifications. The LM2937 series delivers 500mA output current, which is lower than the MIC2937A-12BU's 750mA rating but remains compatible for applications not requiring the full 750mA capacity. Dropout voltage is specified at 1V @ 500mA.

Category 3: Enhanced Automotive-Grade Alternative The TL750M12QKTTRQ1 is a Texas Instruments automotive-grade regulator with 750mA output current matching the MIC2937A-12BU. It features improved dropout voltage of 0.6V @ 750mA, enhanced protection features including reverse polarity protection, and AEC-Q100 automotive qualification. This part is suitable for applications requiring automotive-grade reliability and compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications: The MIC2937A-12WU is the recommended substitute when full 750mA output current and 0.75V dropout voltage specifications must be maintained. This part is manufactured by Microchip Technology, the original manufacturer of the MIC2937A-12BU, ensuring design continuity and compatibility. The MIC2937A-12WU carries active product status and RoHS3 compliance, addressing the obsolescence and regulatory concerns of the original part.

For Cost-Optimized Substitution: The LM2937ES-12/NOPB and LM2937ESX-12/NOPB from Texas Instruments are suitable alternatives for applications where 500mA output current is sufficient. These parts maintain identical 12V output voltage, TO-263-3 package compatibility, and operating temperature range. Both variants are RoHS3 compliant and carry active product status. The primary trade-off is reduced output current capacity and increased dropout voltage (1V @ 500mA versus 0.75V @ 750mA).

For Automotive and Enhanced Reliability Applications: The TL750M12QKTTRQ1 is specified for applications requiring automotive-grade components with AEC-Q100 qualification. This part delivers 750mA output current with superior dropout voltage performance (0.6V @ 750mA) and comprehensive protection features including reverse polarity protection. The automotive-grade qualification and enhanced feature set make this part suitable for demanding industrial and automotive environments.

Frequently Asked Questions (FAQ)

Q: Can the MIC2937A-12WU be used as a direct replacement for the MIC2937A-12BU? A: Yes. The MIC2937A-12WU is a direct equivalent with identical electrical specifications, including 12V output voltage, 750mA output current, 0.75V dropout voltage at 750mA, and TO-263-3 package. The primary advantages are active product status and RoHS3 compliance.

Q: What is the difference between the LM2937ES-12/NOPB and LM2937ESX-12/NOPB? A: Both parts are electrically identical with 12V output and 500mA output current. The primary difference is packaging: LM2937ES-12/NOPB is supplied in Tube packaging, while LM2937ESX-12/NOPB is supplied in Cut Tape (CT) and Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Can I use the LM2937ES-12/NOPB if my application requires 750mA output current? A: The LM2937ES-12/NOPB is rated for 500mA maximum output current. Use in applications requiring 750mA output current is not recommended. The MIC2937A-12WU or TL750M12QKTTRQ1 are appropriate alternatives for 750mA applications.

Q: What are the advantages of the TL750M12QKTTRQ1 over other substitutes? A: The TL750M12QKTTRQ1 provides 750mA output current with improved dropout voltage (0.6V @ 750mA), enhanced protection features including reverse polarity protection, and AEC-Q100 automotive qualification. These specifications make it suitable for automotive and high-reliability applications.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed (MIC2937A-12WU, LM2937ES-12/NOPB, LM2937ESX-12/NOPB, and TL750M12QKTTRQ1) are RoHS3 compliant, addressing the RoHS non-compliance status of the obsolete MIC2937A-12BU.

Q: Is the TO-263-3 package compatible across all substitute parts? A: Yes. All substitute parts use the TO-263-3 package (D2PAK with 3 leads and tab), ensuring PCB layout and footprint compatibility with the original MIC2937A-12BU design.

Q: What is the operating temperature range for all substitute parts? A: All substitute parts operate across the -40°C to 125°C temperature range, matching the original MIC2937A-12BU specification.